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A light ray enters a rectangular block of plastic at an angle $\theta_{1}=45.0^{\circ}$ and emerges at an angle $\theta_{2}=76.0^{\circ},$ as shown in Figure P 22.57 . (a) Determine the index of refraction of the plastic. (b) If the light ray enters the plastic at a point $L=50.0 \mathrm{cm}$ from the bottom edge, how long does it take the light ray to travel through the plastic?

a. $\text { The index of refraction of plastic is }$ n=1.20

b. $\text { The time taken for a light ray to travel through plastic is } 3.39 \mathrm{ns}$

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Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

Hope College

McMaster University

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